Stress measuring device based on compact assembly type LCR wave wedge block

Abstract

The invention discloses a stress measurement device based on a compact assembly type LCR wave wedge block, and belongs to the technical field of ultrasonic stress measurement. The problems that the thickness of a coupling layer is difficult to keep constant, the signal-to-noise ratio of LCR waves is low and the spatial resolution of measurement is low in the existing LCR wave method stress measurement are solved. Comprising a transmitting end wedge block, a receiving end wedge block, a clamp body, a transmitting transducer and a receiving transducer, the transmitting end wedge block and the receiving end wedge block are oppositely and fixedly connected, inclined planes are machined at the top ends of the two wedge blocks, the two inclined planes are distributed in a splayed shape, and the transmitting transducer is vertically and fixedly arranged on the inclined plane of the transmitting end wedge block; the receiving transducer is vertically and fixedly arranged on the inclined surface of the receiving end wedge block, the clamp body is buckled on the outer sides of the transmitting end wedge block and the receiving end wedge block, and an air gap is formed between the transmitting end wedge block and the receiving end wedge block, so that the propagation of direct waves in the wedge blocks is blocked, and the interference of the direct waves on LCR waves is avoided. And the distance between the transmitting transducer and the receiving transducer is greatly shortened.

Description

Technical Field

[0001] The invention relates to a stress measuring device based on a compact assembled LCR wave wedge, belonging to the technical field of ultrasonic stress measurement. Background Art

[0002] Large precision rotary equipment plays a vital role in the defense industry and engineering fields. These devices are subjected to huge mechanical stress, thermal stress and other environmental stresses during operation. Therefore, effective stress monitoring and analysis of them is the key to ensure their safe, reliable and efficient operation.

[0003] As a non-destructive testing technology, ultrasonic method is widely used in stress measurement of large precision rotating equipment due to its advantages of high precision, non-contact measurement and real-time monitoring. Ultrasonic critical refraction longitudinal wave (LCR wave) is the most widely used and also the most sensitive wave type to stress.

[0004] The measuring wedge is the carrier of the transceiver unit of the LCR wave stress detection equipment. It is used to install the ultrasonic transducer and make the ultrasonic wave incident on the test piece at a certain tilt angle, thereby generating LCR waves in the test piece. However, the common LCR wave wedge and its fixing device have the following problems:

[0005] 1. Before measurement, a coupling agent needs to be applied to the surface of the measured object so that the wedge can fully contact the measured object, thereby reducing the reflectivity of the ultrasonic wave and improving the quality of the LCR wave signal. The current wedge fixture makes it difficult to control the thickness and distribution of the coupling layer. Changes in the thickness of the coupling layer at the micron level will cause a significant change in the propagation time of the LCR wave, thereby introducing stress measurement errors. Therefore, the traditional LCR wave sensor fixture cannot ensure that the thickness of the coupling layer remains consistent with the thickness of the coupling layer at the previous measurement position or stress coefficient calibration when the measurement position is changed, resulting in stress measurement errors.

[0006] 2. In the use of common LCR wave sensor fixtures, the operator's experience and techniques have a great impact on the actual stress measurement value. Different operating techniques, such as the amount of coupling agent applied and the pressure of the wedge, may even cause the stress measurement value to differ by more than 50%.

[0007] 3. Traditional LCR wave wedges are mostly integrated structures. The integrated structure will cause part of the signal to propagate directly through the wedge to the receiving transducer, and superimpose with the LCR wave that propagates in the DUT and then reaches the receiving transducer, thereby reducing the LCR wave signal-to-noise ratio. The assembled structure can improve the LCR wave signal-to-noise ratio and reduce the distance between the transmitting and receiving transducers, but the current fixing device still cannot ensure that the coupling agent thickness between the wedge and the DUT remains unchanged during the measurement process.

[0008] 4. The stress measured by the LCR wave is the average stress over its propagation distance, and the propagation distance is inversely proportional to the spatial resolution of the stress measurement. It is difficult to make the distance between the ultrasonic transmitting and receiving transducers of the integrated wedge very small, which leads to a large propagation distance of the LCR wave and low spatial resolution of the stress measurement. Low spatial resolution makes it difficult to accurately reflect the stress in a small area of ​​the measured object and to accurately reconstruct the stress field. Summary of the invention

[0009] The present invention aims to solve the problems in the existing LCR wave stress measurement that the coupling layer thickness is difficult to maintain constant, the LCR wave signal-to-noise ratio is low, and the spatial resolution of the measurement is low, and further provides a stress measurement device based on a compact assembled LCR wave wedge.

[0010] The technical solution adopted by the present invention to solve the above technical problems is:

[0011] A stress measuring device based on a compact assembled LCR wave wedge comprises a transmitting end wedge, a receiving end wedge, a clamp body, a transmitting transducer and a receiving transducer.

[0012] The transmitting end wedge, the receiving end wedge and the clamp are all arranged on the upper surface of the measured object, and ultrasonic coupling agent is filled between the transmitting end wedge and the measured object and between the receiving end wedge and the measured object.

[0013] The transmitting end wedge block and the receiving end wedge block are relatively fixed and the tops of the two wedge blocks are processed with inclined surfaces, and the two inclined surfaces are distributed in an eight-shaped shape. The transmitting transducer is vertically fixed on the inclined surface of the transmitting end wedge block, and the receiving transducer is vertically fixed on the inclined surface of the receiving end wedge block.

[0014] The clamp body is buckled and mounted on the outside of the transmitting end wedge block and the receiving end wedge block, and the inner wall surfaces on both sides of the clamp body are directly in contact with one end surface of the transmitting end wedge block and one end surface of the receiving end wedge block respectively.

[0015] The first to third clamping bolts are installed on the upper part of the clamp body. The first clamping bolt and the second clamping bolt are used to clamp the transmitting transducer and the receiving transducer respectively, and the third clamping bolt is used to clamp the transmitting end wedge and the receiving end wedge.

[0016] Furthermore, the clamp body includes two side plates arranged vertically and in parallel, a top plate fixed between the tops of the two side plates, and bottom plates respectively fixed to the outer sides of the bottoms of the two side plates, wherein the first to third clamping bolts are all installed on the top plate, and the bottom end surfaces of the side plates and the bottom end surfaces of the bottom plate are in direct contact with the upper surface of the test piece.

[0017] Furthermore, a receiving groove is provided at the bottom end of the bottom plate, and a strong magnet is installed in the receiving groove.

[0018] Furthermore, two clamping bolts are connected between the two side plates, and the two clamping bolts are used to adjust the clamping force between the two side plates and the two wedge blocks through two clamping nuts.

[0019] Furthermore, the lower surface of the top plate is processed with first to third grooves to accommodate first to third nuts corresponding to the first to third clamping bolts.

[0020] Furthermore, the transmitting end wedge block includes an integrally formed first rectangular block, a wedge block and a second rectangular block, wherein the first rectangular block is located at the large-sized end of the wedge block, and the second rectangular block is located at the small-sized end of the wedge block. The receiving end wedge block has the same structure as the transmitting end wedge block, and the first rectangular blocks of the two wedge blocks are relatively fixed.

[0021] Furthermore, two mounting blocks are fixedly mounted on both sides of each first rectangular block, and the two mounting blocks located on the same side of the two first rectangular blocks are fixedly connected by connecting bolts and connecting nuts.

[0022] Furthermore, a fourth groove is processed on the inclined surface of the top of the transmitting end wedge block, and a fifth groove is processed on the inclined surface of the top of the receiving end wedge block. The transmitting transducer and the receiving transducer are fixed in the fourth groove and the fifth groove respectively.

[0023] Furthermore, the inclination angles of the inclined surface at the top of the transmitting end wedge and the inclined surface at the top of the receiving end wedge are the first critical angle α, and α is calculated according to Snell's law, and the calculation formula is as follows:

[0024] α=arcsin(V W / V M ),

[0025] V W is the ultrasonic longitudinal wave velocity in the wedge,

[0026] V M is the ultrasonic longitudinal wave velocity in the test piece.

[0027] Furthermore, the minimum distance between the transmitting transducer and the receiving transducer is 5 mm.

[0028] Compared with the prior art, the present invention has the following effects:

[0029] The present invention changes the traditional integrated wedge block into an assembled structure, constructs an air gap between the transmitting end wedge block and the receiving end wedge block, blocks the propagation of the direct wave in the wedge block, and avoids the interference of the direct wave on the LCR wave. The existence of the air gap enables the transmitting end wedge block and the receiving end wedge block to be assembled into a compact structure, that is, greatly shortens the distance between the transmitting transducer and the receiving transducer.

[0030] The stress measurement device based on the compact assembled LCR wave wedge of the present invention forms an assembled wedge by separately setting a transmitting end wedge and a receiving end wedge. The assembled wedge is used as a carrier of the transceiver unit. It is difficult for ultrasonic waves to pass through the interface between the transmitting end wedge and the receiving end wedge. Therefore, the ultrasonic wave propagation path is the transmitting end wedge-test piece-receiving end wedge. The assembled structure avoids the signal in the integrated wedge that is directly transmitted through the wedge to the receiving end transducer and the aliasing of the LCR wave signal, which can improve the quality of the LCR wave signal and effectively reduce the influence of the interference signal, thereby achieving high signal-to-noise ratio acquisition of the LCR wave signal and improving the stress measurement accuracy.

[0031] The stress measurement device based on a compact assembled LCR wave wedge of the present invention adopts an assembled wedge as a carrier of a transceiver unit. Compared with an integrated wedge, the compactness of the structure is improved, and the distance between the transmitting and receiving transducers is effectively reduced, thereby reducing the propagation distance of the LCR wave (stress measurement range) and improving the spatial resolution of stress measurement.

[0032] The third clamping bolt is used to apply pressure to the compact assembled LCR wave wedge to ensure that the pressure between the assembled wedge and the measured object is constant, thereby ensuring that the thickness of the coupling layer between the two is unchanged and uniform when measuring stress at different positions, thereby improving the stress measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of a stress measurement device based on a compact assembled LCR wave wedge according to the present invention;

[0034] Figure 2 A side view schematic diagram of a stress measurement device based on a compact assembled LCR wave wedge according to the present invention;

[0035] Figure 3 It is a main cross-sectional schematic diagram of a stress measurement device based on a compact assembled LCR wave wedge block of the present invention.

[0036] In the figure:

[0037] 1. Transmitter wedge; 1-1. Mounting block; 2. Receiver wedge; 3. Clamp base; 3-1. Side plate; 3-2. Top plate; 3-3. Bottom plate; 3-4. Strong magnet; 3-5. Clamping bolt; 3-6. Clamping nut; 4. Transmitter transducer; 5. Receiving transducer; 6. Measured object; 7. First clamping bolt; 8. Second clamping bolt; 9. Third clamping bolt; 10. First nut; 11. Second nut; 12. Third nut; 13. Connecting bolt. DETAILED DESCRIPTION

[0038] Specific implementation method 1: Combination Figure 1 to Figure 3This embodiment is explained, and the technical scheme in the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] It should be noted that the descriptions of the present invention regarding directions such as "front", "back", "left", "right", "inside", "outside", "left side", "right side", "upper", "lower", "top", "bottom", etc. are all defined based on the relationship between the orientations or positions shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] A stress measurement device based on a compact assembled LCR wave wedge comprises a transmitting end wedge 1, a receiving end wedge 2, a clamp body 3, a transmitting transducer 4 and a receiving transducer 5.

[0042] The transmitting end wedge block 1, the receiving end wedge block 2 and the clamp body 3 are all arranged on the upper surface of the measured object 6, and the space between the transmitting end wedge block 1 and the measured object 6 and the space between the receiving end wedge block 2 and the measured object 6 are filled with ultrasonic coupling agent.

[0043] The transmitting end wedge block 1 and the receiving end wedge block 2 are relatively fixed and the tops of the two wedge blocks are processed with inclined surfaces, and the two inclined surfaces are distributed in an eight-shaped shape. The transmitting transducer 4 is vertically fixed on the inclined surface of the transmitting end wedge block 1, and the receiving transducer 5 is vertically fixed on the inclined surface of the receiving end wedge block 2.

[0044] The clamp body 3 is buckled on the outside of the transmitting end wedge block 1 and the receiving end wedge block 2, and the inner wall surfaces on both sides of the clamp body 3 are directly in contact with one end surface of the transmitting end wedge block 1 and one end surface of the receiving end wedge block 2 respectively.

[0045] The first to third clamping bolts are installed on the upper part of the clamp body 3. The first clamping bolt 7 and the second clamping bolt 8 are used to clamp the transmitting transducer 4 and the receiving transducer 5 respectively, and the third clamping bolt 9 is used to clamp the transmitting end wedge 1 and the receiving end wedge 2.

[0046] The transmitting transducer 4 and the receiving transducer 5 are the transceiver units in the stress measuring device.

[0047] The first clamping bolt 7 is coaxially arranged with the transmitting transducer 4 and in direct contact with it, and the second clamping bolt 8 is coaxially arranged with the receiving transducer 5 and in direct contact with it.

[0048] The third clamping bolt 9 is vertically arranged just above the joint between the transmitting end wedge block 1 and the receiving end wedge block 2, and the third clamping bolt 9 is in direct contact with the two wedge blocks to simultaneously clamp the transmitting end wedge block 1 and the receiving end wedge block 2.

[0049] The first clamping bolt 7 is equipped with a first nut 10, the second clamping bolt 8 is equipped with a second nut 11, and the third clamping bolt 9 is equipped with a third nut 12. The nuts are used to lock the clamping bolts, and the clamping force on the transmitting transducer 4, the receiving transducer 5 and the two wedges is adjusted by tightening or loosening the first to third clamping bolts.

[0050] The transmitting transducer 4 transmits ultrasonic waves, and the ultrasonic signals form LCR waves in the test piece 6 after passing through the transmitting end wedge 1 and propagate in a direction parallel to the upper surface of the test piece 6. The LCR waves pass through the receiving end wedge 2 and are received by the receiving transducer 5. The stress measurement in the test piece 6 is achieved based on the propagation time difference of the LCR waves with and without stress.

[0051] No ultrasonic coupling agent is applied to the contact surface between the transmitting end wedge block 1 and the receiving end wedge block 2, so that an air gap is formed on the contact surface. The existence of the air gap causes the ultrasonic wave to be reflected when it propagates to the contact surface, that is, the ultrasonic wave emitted by the transmitting transducer 4 cannot directly reach the receiving transducer 5 through the contact surface between the transmitting end wedge block 1 and the receiving end wedge block 2. If the existing integrated wedge block (that is, the transmitting end wedge block 1 and the receiving end wedge block 2 are an integral whole) is used, the ultrasonic wave (direct arrival wave) that reaches the receiving transducer 5 through the wedge block and the LCR wave that propagates in the test piece 6 and then reaches the receiving transducer 5 will overlap and interfere with each other, causing the LCR wave waveform to be distorted and reducing its signal-to-noise ratio. The shorter the distance between the transmitting transducer 4 and the receiving transducer 5, the more serious the interference of the direct arrival wave on the LCR wave. Therefore, it is difficult for the existing integrated wedge block to achieve the excitation and reception of LCR waves at a short distance.

[0052] The present invention changes the traditional integrated wedge into an assembled structure, constructs an air gap between the transmitting end wedge 1 and the receiving end wedge 2, blocks the propagation of the direct wave in the wedge, and avoids the interference of the direct wave on the LCR wave. The existence of the air gap enables the transmitting end wedge 1 and the receiving end wedge 2 to be assembled into a compact structure, that is, the distance between the transmitting transducer 4 and the receiving transducer 5 is greatly shortened.

[0053] The stress measurement device based on the compact assembled LCR wave wedge of the present invention forms an assembled wedge by respectively setting a transmitter wedge 1 and a receiver wedge 2. The assembled wedge is used as a carrier of the transceiver unit. It is difficult for ultrasonic waves to pass through the interface between the transmitter wedge 1 and the receiver wedge 2. Therefore, the ultrasonic wave propagation path is the transmitter wedge 1-test piece 6-receiver wedge 2. The assembled structure avoids the signal in the integrated wedge that is directly transmitted through the wedge to the receiver transducer and the aliasing of the LCR wave signal, which can improve the quality of the LCR wave signal and effectively reduce the influence of the interference signal, thereby achieving high signal-to-noise ratio acquisition of the LCR wave signal and improving the stress measurement accuracy.

[0054] The stress measurement device based on a compact assembled LCR wave wedge of the present invention adopts an assembled wedge as a carrier of a transceiver unit. Compared with an integrated wedge, the compactness of the structure is improved, and the distance between the transmitting and receiving transducers is effectively reduced, thereby reducing the propagation distance of the LCR wave (stress measurement range) and improving the spatial resolution of stress measurement.

[0055] The third clamping bolt 9 is used to apply pressure to the compact assembled LCR wave wedge to ensure constant pressure between the assembled wedge and the measured object 6, thereby ensuring that the thickness of the coupling layer between the two is unchanged and uniform when measuring stress at different positions, thereby improving the stress measurement accuracy.

[0056] The clamp body 3 includes two side plates 3-1 arranged vertically and in parallel, a top plate 3-2 fixed between the tops of the two side plates 3-1, and bottom plates 3-3 fixed on the outer sides of the bottoms of the two side plates 3-1, wherein the first to third clamping bolts 9 are all installed on the top plate 3-2, and the bottom end surfaces of the side plates 3-1 and the bottom end surfaces of the bottom plate 3-3 are in direct contact with the upper surface of the tested piece 6. With such a design, the clamp body 3 is an integrally formed structure. The top plate 3-2 includes two inclined plates and an integrally formed horizontal plate fixed between the two inclined plates, and the first clamping bolt 7 and the second clamping bolt 8 are respectively installed on the two inclined plates to better achieve the clamping of the transmitting transducer 4 and the receiving transducer 5.

[0057] The bottom end of the bottom plate 3-3 is provided with a receiving groove, in which a strong magnet 3-4 is installed. With such a design, the strong magnet 3-4 is used to provide a constant attraction force, so that the stress measuring device is adsorbed on the measured object 6 as a whole.

[0058] Two clamping bolts 3-5 are connected between the two side plates 3-1, and the two clamping bolts 3-5 are used to adjust the clamping force between the two side plates 3-1 and the two wedges through two clamping nuts 3-6. In this design, the clamping body 3 and the two wedges are clamped by the two clamping bolts 3-5 and the two clamping nuts 3-6. The two clamping bolts 3-5 are preferably arranged in the middle of the side plates 3-1 and symmetrically arranged on both sides of the transducer, so that the contact surface between one side plate 3-1 and the transmitting end wedge 1 and the other side plate 3-1 and the receiving end wedge 2 is evenly stressed.

[0059] The lower surface of the top plate 3-2 is processed with first to third grooves to accommodate the first to third nuts corresponding to the first to third clamping bolts. With such a design, the upper ends of the first to third nuts are correspondingly located in the first to third grooves, and the first to third grooves reduce the space occupied by the first to third nuts, thereby further reducing the volume of the entire stress measurement device to make its structure more compact.

[0060] The transmitting end wedge block 1 includes an integrally formed first rectangular block, a wedge block and a second rectangular block, wherein the first rectangular block is located at the large-size end of the wedge block, and the second rectangular block is located at the small-size end of the wedge block. The receiving end wedge block 2 has the same structure as the transmitting end wedge block 1, and the first rectangular blocks of the two wedge blocks are relatively fixed. With such a design, the transmitting transducer 4 and the receiving transducer 5 are respectively mounted on the two wedge blocks, the inclined surface is the top surface of the wedge block, and the bottom surface of the wedge block is a horizontal surface. By using two first rectangular blocks, the top surfaces are both horizontal surfaces, which facilitates the contact between the third clamping bolt 9 and the wedge block.

[0061] Two mounting blocks 1-1 are fixedly mounted on both sides of each first rectangular block, and the two mounting blocks 1-1 on the same side of the two first rectangular blocks are fixedly connected by connecting bolts 13 and connecting nuts. In this design, the four mounting blocks 1-1 are fixedly connected in pairs by a plurality of connecting bolts 13, so that the transmitting end wedge block 1 and the receiving end wedge block 2 are clamped together to form a whole, which is convenient for disassembly and assembly.

[0062] A fourth groove is machined on the inclined surface of the top of the transmitting end wedge block 1, and a fifth groove is machined on the inclined surface of the top of the receiving end wedge block 2. The transmitting transducer 4 and the receiving transducer 5 are fixed in the fourth groove and the fifth groove respectively. In this design, the positioning and installation of the transmitting transducer 4 and the receiving transducer 5 are realized by setting the fourth groove and the fifth groove.

[0063] The inclination angles of the inclined surface at the top of the transmitting end wedge block 1 and the inclined surface at the top of the receiving end wedge block 2 are the first critical angle α, which is calculated according to Snell's law, and the calculation formula is as follows:

[0064] α=arcsin(V W / V M ),

[0065] V W is the ultrasonic longitudinal wave velocity in the wedge,

[0066] V M is the ultrasonic longitudinal wave velocity in the test piece 6.

[0067] The minimum distance between the transmitting transducer 4 and the receiving transducer 5 is 5 mm. With such a design, the distance between the transmitting transducer 4 and the receiving transducer 5 using an integrated wedge as a carrier in the prior art is usually 20 mm. The assembled wedge of the present invention can greatly shorten the distance between the transmitting transducer 4 and the receiving transducer 5, thereby reducing the propagation distance of the LCR wave and greatly improving the spatial resolution of stress measurement.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A stress measurement device based on a compact assembled LCR wave wedge, characterized in that: It comprises a transmitting end wedge (1), a receiving end wedge (2), a clamp body (3), a transmitting transducer (4) and a receiving transducer (5), The transmitting end wedge block (1), the receiving end wedge block (2) and the clamp body (3) are all arranged on the upper surface of the measured object (6), and ultrasonic coupling agent is filled between the transmitting end wedge block (1) and the measured object (6) and between the receiving end wedge block (2) and the measured object (6). The transmitting end wedge block (1) and the receiving end wedge block (2) are fixedly connected relative to each other and the top ends of the two wedge blocks are both processed with inclined surfaces, the two inclined surfaces are distributed in an eight-shaped shape, the transmitting transducer (4) is vertically fixedly mounted on the inclined surface of the transmitting end wedge block (1), and the receiving transducer (5) is vertically fixedly mounted on the inclined surface of the receiving end wedge block (2). The clamp body (3) is buckled on the outer sides of the transmitting end wedge block (1) and the receiving end wedge block (2), and the inner wall surfaces on both sides of the clamp body (3) are in direct contact with one end surface of the transmitting end wedge block (1) and one end surface of the receiving end wedge block (2) respectively. The first to third clamping bolts are installed on the upper part of the clamp body (3), and the transmitting transducer (4) and the receiving transducer (5) are respectively clamped by the first clamping bolt (7) and the second clamping bolt (8), and the transmitting end wedge block (1) and the receiving end wedge block (2) are clamped by the third clamping bolt (9).

2. A stress measurement device based on a compact assembled LCR wave wedge according to claim 1, characterized in that: The clamp body (3) comprises two side plates (3-1) arranged vertically and in parallel, a top plate (3-2) fixed between the tops of the two side plates (3-1), and a bottom plate (3-3) fixed respectively on the outer sides of the bottoms of the two side plates (3-1), wherein the first to third clamping bolts (9) are all mounted on the top plate (3-2), and the bottom end surfaces of the side plates (3-1) and the bottom end surfaces of the bottom plate (3-3) are both in direct contact with the upper surface of the tested object (6).

3. A stress measurement device based on a compact assembled LCR wave wedge according to claim 2, characterized in that: A receiving groove is provided at the bottom end of the bottom plate (3-3), and a strong magnet (3-4) is installed in the receiving groove.

4. A stress measurement device based on a compact assembled LCR wave wedge according to claim 2, characterized in that: Two clamping bolts (3-5) are connected between the two side plates (3-1), and the two clamping bolts (3-5) are used to adjust the clamping force between the two side plates (3-1) and the two wedge blocks through two clamping nuts (3-6).

5. A stress measurement device based on a compact assembled LCR wave wedge according to claim 2, characterized in that: The lower surface of the top plate (3-2) is processed with first to third grooves to accommodate first to third nuts corresponding to the first to third clamping bolts.

6. A stress measurement device based on a compact assembled LCR wave wedge according to claim 1, characterized in that: The transmitting end wedge block (1) comprises an integrally formed first rectangular block, a wedge block and a second rectangular block, wherein the first rectangular block is located at the large-sized end of the wedge block, and the second rectangular block is located at the small-sized end of the wedge block; the receiving end wedge block (2) has the same structure as the transmitting end wedge block (1), and the first rectangular blocks of the two wedge blocks are relatively fixed.

7. A stress measurement device based on a compact assembled LCR wave wedge according to claim 6, characterized in that: Two mounting blocks (1-1) are fixedly mounted on both sides of each first rectangular block, and the two mounting blocks (1-1) located on the same side of the two first rectangular blocks are fixedly connected via connecting bolts (13) and connecting nuts.

8. The stress measurement device based on the compact assembled LCR wave wedge according to claim 1, characterized in that: A fourth groove is machined on the inclined surface at the top of the transmitting end wedge block (1), a fifth groove is machined on the inclined surface at the top of the receiving end wedge block (2), and the transmitting transducer (4) and the receiving transducer (5) are fixedly mounted in the fourth groove and the fifth groove respectively.

9. The stress measurement device based on the compact assembled LCR wave wedge according to claim 1, characterized in that: The inclination angles of the inclined surface at the top of the transmitting end wedge block (1) and the inclined surface at the top of the receiving end wedge block (2) are the first critical angle α, which is calculated according to Snell's law, and the calculation formula is as follows: α=arcsin(V W / V M ), V W is the ultrasonic longitudinal wave velocity in the wedge, V M is the ultrasonic longitudinal wave velocity in the test piece (6).

10. A stress measurement device based on a compact assembled LCR wave wedge according to claim 1, characterized in that: The minimum distance between the transmitting transducer (4) and the receiving transducer (5) is 5 mm.

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